// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2015 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include "main.h"
#include <limits>
#include <map>

#include <Eigen/CXX11/Tensor>
#include <Eigen/Dense>

using Eigen::Tensor;

template<int DataLayout>
static void
test_map_as_index()
{
#ifdef EIGEN_HAS_SFINAE
	Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
	tensor.setRandom();

	using NormalIndex = DSizes<ptrdiff_t, 4>;
	using CustomIndex = std::map<ptrdiff_t, ptrdiff_t>;
	CustomIndex coeffC;
	coeffC[0] = 1;
	coeffC[1] = 2;
	coeffC[2] = 4;
	coeffC[3] = 1;
	NormalIndex coeff(1, 2, 4, 1);

	VERIFY_IS_EQUAL(tensor.coeff(coeffC), tensor.coeff(coeff));
	VERIFY_IS_EQUAL(tensor.coeffRef(coeffC), tensor.coeffRef(coeff));
#endif
}

template<int DataLayout>
static void
test_matrix_as_index()
{
#ifdef EIGEN_HAS_SFINAE
	Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
	tensor.setRandom();

	using NormalIndex = DSizes<ptrdiff_t, 4>;
	using CustomIndex = Matrix<unsigned int, 4, 1>;
	CustomIndex coeffC(1, 2, 4, 1);
	NormalIndex coeff(1, 2, 4, 1);

	VERIFY_IS_EQUAL(tensor.coeff(coeffC), tensor.coeff(coeff));
	VERIFY_IS_EQUAL(tensor.coeffRef(coeffC), tensor.coeffRef(coeff));
#endif
}

template<int DataLayout>
static void
test_varlist_as_index()
{
#ifdef EIGEN_HAS_SFINAE
	Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
	tensor.setRandom();

	DSizes<ptrdiff_t, 4> coeff(1, 2, 4, 1);

	VERIFY_IS_EQUAL(tensor.coeff({ 1, 2, 4, 1 }), tensor.coeff(coeff));
	VERIFY_IS_EQUAL(tensor.coeffRef({ 1, 2, 4, 1 }), tensor.coeffRef(coeff));
#endif
}

template<int DataLayout>
static void
test_sizes_as_index()
{
#ifdef EIGEN_HAS_SFINAE
	Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
	tensor.setRandom();

	DSizes<ptrdiff_t, 4> coeff(1, 2, 4, 1);
	Sizes<1, 2, 4, 1> coeffC;

	VERIFY_IS_EQUAL(tensor.coeff(coeffC), tensor.coeff(coeff));
	VERIFY_IS_EQUAL(tensor.coeffRef(coeffC), tensor.coeffRef(coeff));
#endif
}

EIGEN_DECLARE_TEST(cxx11_tensor_custom_index)
{
	test_map_as_index<ColMajor>();
	test_map_as_index<RowMajor>();
	test_matrix_as_index<ColMajor>();
	test_matrix_as_index<RowMajor>();
	test_varlist_as_index<ColMajor>();
	test_varlist_as_index<RowMajor>();
	test_sizes_as_index<ColMajor>();
	test_sizes_as_index<RowMajor>();
}
